a

1 files changed, 16 insertions, 0 deletions

diff --git a/src/emplacer.hpp b/src/emplacer.hpp
new file mode 100644
index 00000000..eca115e8
--- /dev/null
+++ b/src/emplacer.hpp
@@ -0,0 +1,16 @@
+#pragma once
+#include <type_traits>
+
+namespace floormat {
+
+template<typename F>
+class emplacer {
+    F fun;
+    using type = std::decay_t<decltype(std::declval<F>()())>;
+
+public:
+    explicit constexpr emplacer(F&& fun) noexcept : fun{std::forward<F>(fun)} {}
+    constexpr operator type() const noexcept { return fun(); }
+};
+
+} // namespace floormat